Ventilator.



A. MCALLISTER.

VENTILATOR.

APPLICATION FILED JULY l8, I917.

1,285,275. Putented'Nov. 19, 1918.

HG. 1 I /5 7 l8 HG. 2

9| I 15' 1 ll 0 5 L /2 Y Y 6 FIG. 3 /7 WITNESSES or .t were; com 'LIQNor rnrinsrnva'nra,

31,285,2E' I Specification of Fietters TTSEURGT-I, EIENFJ'S'YZFDREE'IA,ASSIGNQR TO ASBESTQ NY, OF PITTSIBUYL as- PENNSYLVAETIA, .51. GQBTPGZ.

VENTILATOIEL Application filed July 18, 1917. 1*1'0. 181,259.

To (ZZZ whom it may concern:

it known that i, ALBERT lilcrluasrnn, a citizen of the United States,and resident of Pittsburgh, in the county of Allegheny and State ofPennsylvania, have invented certain new andusetul Improvements inVentilators, of which the following is a specification.

My invention relates to the construction of ventilators used to connectthe interior with the exterior of buildings, vessels, chimneys, andsimilar structures, to ventilate such structures.

One object of this invention is the provision of aventilator of improvedconstruction having novel means wherein the tree outflow of air or othergaseous fluid through the ventilator is obtained and maintained andwhereby such outflow is augmented by the actionot air currents strikingthe ventilator, and the entrance and passageof rainiand snow into andthrough the ventilator is avoided and prevented.

Another object of the invention is the provision of a ventilator havingthe novel constructions, combinations, and arrange ments of parts shownin the drawings, to be fullydescribed hereinafter and to be particularlypointed out in the appended claims.

Referring now to the drawings, forming part of'this specification,Figure 1 is a sectional elevation of a ventilator embodying myinvention. 7 I

Fig. 2 is a sectional plan, the section being taken on the line 11-11 ofFig. 1. Fig. 3 is an elevation of the ventilator shown in Figs. 1 and 2.

Fig. i is a plan ofthe ventilator shownin Figs. 1, 2, and 3.

Fig. 5 is a transverse section on the line VV of Fig. 1 showing detailsin the construction of the ventilator of Figs. 1, 2, 8, and 4.

Fig. 5 is a transverse section similarto that of Fig. 5, showing amodification in the construction of the ventilator.

In the accompanying drawings, the numer-al' 2 designates a'n eductionpipe, cylindrical in cross section as shown which is adapted forattachment by its lower end to a building, vessel, chimney or the like,to exhaust air, smoke, orsimilar gaseous fluid therefrom, and secured onthe outer surface of the edwietion pipe is a plurality of sheets or p. storining a series of equailr spaced, radial vanes or wind guides 5, ti evanes extending lengthwise verticali, tor some distance above the upperend i ot' the eduction pipe. Surrounding the upper end of the pipe 2 ISa trusto-conical hood this hood being conveniently sup ported by theupwardly and inwardly ta pel'lng outer edges 6 of the vanes 3 and the isconsiderably above the upper end i of the eduction pipe, so that theseries of channels 8 open transversely or inwardly immediately above theend' i of the ed-uction pipe 2 into the chamber 20.

Fastened .on' the outer surface of the frusto-conical hood 5 is aplurality'of equally spaced, lengthwise vertical plates forming a seriesof radial vanes or wings 10 which have substantially vertical outeredges 11. "The outer edge 11 of each of the wings 10 has an offset orjog 12 at the upper end thereofiand supported on these jogs is a tubularshield 13. The shield 18, which is of a diameter the same or, as shown,slightly less than that of the lower or large end 7 of the frustoconicalhood 5, extends from slightly below to some distance above the upperedge 9 of the hood 5 and its overlapping lower end 15 co-acts with thewings 10 and upper end of the hood 5 to form a seriesof verticalpassages or channels 16. Secured within the shield 13 in the upper endthereof, is a conical top or cap 17, this capbeing fastened to theshield by straps 18, and being smaller in diameter than the internaldiameter of the shield so as to provide an annular passage 19 within theshield connecting the chamber or space 20 below with the exterior oftheshield above th cap 17.

Freferably the vanes or guides 8 and the wings 10 will be separatelyformed, as shown in Figs. 1, 2, and 5, with flanges 21 on the edgesthereoi for attachment to the irusto- With said external channels toform an inlet thereto for downwardly moving currents of air.

4:. A ventilator comprising an eduction pipe, a conical hood surroundingsaid eduction pipe and extended above and below the upper end thereofoutside of said pipe and separated therefrom to form therewith an aratedthereform, wings interposed between said hood and pipe to form airpassages, vanes interposed between said hood and shield to form airchannels, and an upwardly conical cap in proximity to the upper end ofsaid conical hood and cooperating with the air passages Within the hoodand the air channels on the outside of said hood for the purposespecified. 1

In testimony whereof I have hereunto set my hand.

ALBERT MCALLISTER.

